Poor hydration habits before, during, and after exercise. Our bodies are around 55-65% water. Humans can live for weeks without food but only days without water. We depend on good hydration for basic function of our systems. For athletic performance, the demand is even greater because athletes need to maintain a greater blood volume, sweat for temperature regulation, sustain tissue integrity, and repair exercise-induced damage and injuries.

Dehydration will decrease blood volume and with that decrease you won’t be able to cool yourself effectively or supply the working muscles with enough blood. If your core temperature reaches 103-104 degrees, the hypothalamus in the brain will just say “no.” Your movements will slow down and your entire nervous system will not function at its optimal level. And nobody loves that dizzy feeling of decreased blood pressure after you stand up from sitting or lying down when dehydrated.

As far as structure is concerned, hyaluronan molecules bind with water to keep your connective tissues, like cartilage and tendon, strong, supple and resilient. Keep the hyaluronan happy by staying hydrated! And we want the muscles to remain loosey-goosey!

Take in 5-10 ounces of fluid every 15 minutes in a warm to hot environment during exercise. Otherwise, try to keep your urine nearly clear. Don’t over drink though, as that can have negative consequences as well.

Avoiding strength training. People tend to gravitate toward what they enjoy most. For many athletes, they just want to do their sport and that’s it. Unfortunately, regardless of sport, some muscles and movements aren’t worked hard enough or frequently enough. We will become very good at using certain muscles, like the hip flexors, which slowly shuts down important muscles like the gluteus maximus.

Core strength is important regardless of sport because your trunk needs to be a stable base while the arms and legs move. As running guru and PT Jay Dicharry says, “You can’t fire a cannon from a canoe.”

A loss of muscle mass as we age can be counteracted (to some extent) with strength training. Overall, it comes down to being a healthy, well-rounded athlete -- and without strength training that’s not possible.

Being afraid to let go of a regimented training program. For those Type-A personalities this is difficult. Your long run doesn’t always have to be on Sunday. Some weeks, you might even need to skip that long run altogether. That twinge in your shoulder while swimming is trying to tell you something, so listen up.

Sticking to a “must do” mentality is a great way to dig yourself into a hole of over-training, injury, staleness, and boredom. That’s particularly true when you aren’t able to optimize the other aspects of training, like nutrition, soft-tissue work, compression, sleep, and so on.

I liken it to the “pay me now or pay me later” philosophy. Take an easier intensity day or a day off when you clearly need it or end up taking several of them in a row once your performance drops, you become ill, or you develop an injury.